First Fernandine War

First Fernandine War
	Part of Fernandine Wars
	; Ferdinand I of Portugal
Date	1369–1371
Location	Iberian Peninsula
Result	Treaty of Alcoutim ; Treaty of Tui (1372)
Belligerents
Portuguese House of Burgundy Kingdom of Portugal and the Algarve Kingdom of Galicia; Zamoran Rebels; ; Crown of Aragon ; Emirate of Granada	House of Trastámara ; Realm of Castile White Company
Commanders and leaders
Ferdinand I of Portugal; Peter IV of Aragon; Lanzarote Pessanha ; Ferdinand Alfonso of Valencia ; Fernando Ruiz de Castro ; Vasco Gomes de Abreu ; Deu-la-Deu Martins ; John Alfonso of Zamora ; Muhammad V of Granada ; Ferdinand of Olivença	Henry of Trastámara ; Ambrosio Bocanegra ; Juana Manuel of Villena ; Pedro Rodrigues Sarmento ; Pedro Manrique Bertrand du Guesclin
Strength
Unknown	Unknown
Casualties and losses
Unknown	Unknown

The First Fernandine War was the initial conflict in the series of wars between the Kingdom of Portugal and the Realm of Castile during the late 14th century. It commenced in 1369 following the assassination of King Pedro I of Castile and concluded in 1371 with the signing of the Treaty of Alcoutim.